Cross section measurements of charged pion photoproduction in hydrogen and deuterium from 1.1 to 5.5 GeV

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Date
2005-04
Authors
Zhu, L.Y.
Arrington, J.
Averett, T.
Beise, E.
Calarco, J.
Chang, T.
Chen, J.P.
Chudakov, E.
Coman, M.
Clasie, B.
Advisor
Citation
L. Y. Zhu et al. Physical Review C 71, no. 4 (2005): 044603(17).
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Abstract
The differential cross sections for the γn→π-p and the γp→π+n processes were measured at Jefferson Lab. The photon energies ranged from 1.1 to 5.5 GeV, corresponding to center-of-mass energies from 1.7 to 3.4 GeV. The pion center-of-mass angles varied from 50° to 110°. The π- and π+ photoproduction data both exhibit a global scaling behavior at high energies and high transverse momenta, consistent with the constituent counting rule prediction and the existing π+ data. The data suggest possible substructure of the scaling behavior, which might be oscillations around the scaling value. The data show an enhancement in the scaled cross section at center-of-mass energy near 2.2 GeV. The differential cross section ratios [dσ/dt(γn→π-p)/dσ/dt(γp→π+n)] at high energies and high transverse momenta can be described by calculations based on one-hard-gluon-exchange diagrams.
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